TRH-303 is a model in the TRH-300 series that can measure temperature and humidity at the same time. Through voltage or current signals, the measured temperature and humidity values are transmitted to the display panel or displayed on the back-end system. The TRH-300 series utilizes sheet-type polymer capacitors to measure temperature and relative humidity accurately. Excellent design, even moisture, dust, dirt, grease, and common chemicals will not affect its measured value.